Table 2

Nonrandomized studies evaluated for bias using the MINORS criteria.

	MINORS Criteria	Pradhan 2015	Feng 2020
1	Clearly stated aim	2	2
2	Inclusion of consecutive patients	0	0
3	Prospective collection of data	2	0
4	Endpoints appropriate to aim of study	2	2
5	Unbiased assessment of the study endpoint	0	2
6	Follow-up period appropriate to the aim of the study	1	1
7	Loss to follow-up less than 5%	0	0
8	Prospective calculation of study size	0	0
9	An adequate control group	2	2
10	Contemporary groups	2	2
11	Baseline equivelance of groups	2	2
12	Adequate statistical analysis	1	2
	Total	14	15

Note: The items are scored 0 (not reported), 1 (reported but inadequate) or 2 (reported and adequate). The global ideal score is 16 for non-comparative studies and 24 for comparative studies
MINORS, methodological index for nonrandomized studies.